package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCarMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //获取当前用户id
        shoppingCart.setUserId(BaseContext.getCurrentId());
//        ShoppingCart shoppingCart = ShoppingCart.builder()
//                .setmealId(shoppingCartDTO.getSetmealId())
//                .dishId(shoppingCartDTO.getDishId())
//                .dishFlavor(shoppingCartDTO.getDishFlavor())
//                .userId(BaseContext.getCurrentId())
//                .build();

        //判断当前加入到购物车中的商品是否已经存在
        // select * from shopping_cart where user_id = ? and setmeal_id = ?/dish_id = ? and dish_flavor = ?
        List<ShoppingCart> list = shoppingCarMapper.list(shoppingCart);
        //如果已经存在，则数量加1
        if (list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCarMapper.update(cart);
        }else { //如果不存在，需要插入一条购物车数据,数量为1
            //判断当前添加到购物车的是菜品还是套餐
            if (shoppingCart.getDishId() != null){//添加的是菜品
                Dish dish = dishMapper.getById(shoppingCart.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {//添加的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            //插入购物车数据
            shoppingCarMapper.insert(shoppingCart);
        }

    }


    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> list = shoppingCarMapper.list(shoppingCart);
        return list;
    }


    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        //获取当前登录微信用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCarMapper.deleteByUserId(userId);
    }


    /**
     * 删除购物车一个商品
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前删除的商品是菜品还是套餐
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCarMapper.list(shoppingCart);

        //判断当前数量是否为1
        ShoppingCart cart = list.get(0);
        //如果数量为1，则从购物车中删除该商品
        if (cart.getNumber() == 1) {
            shoppingCarMapper.deleteById(cart.getId());
        }
        else {//数量不为1
            //如果数量不为1，数量减1
            cart.setNumber(cart.getNumber() - 1);
            shoppingCarMapper.update(cart);
        }
    }
}
